Rolex® calibre 59 flat hairspring, regulated with round stud
Genuine, Rolex® 59 part 734, flat hairspring, regulated with round stud
* H. & W. Perrin Company Limited is independent of and not affiliated with or sponsored by Rolex®. Rolex® warranty does not apply to parts supplied by H. & W. Perrin Company Limited. Using generic parts may devalue your watch.